Is Tallahatchie County, MS a radon risk area?

EPA places Tallahatchie County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Tallahatchie County sits at the 7th percentile nationally for radon potential — above 7 of every 100 rated counties.

Tallahatchie County by the numbers

About 10,921 people live in Tallahatchie County, Mississippi, spread over 645.59 square miles. Averaged across its land area, Tallahatchie County runs about 17 people per square mile. Rank 797 by population within its EPA zone puts Tallahatchie County at the 23rd percentile among zone peers. Tallahatchie County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Tallahatchie County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Even at Zone 3, Tallahatchie County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Tallahatchie County tests above the action level

Nothing about Tallahatchie County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Mississippi's state radon program

Tallahatchie County's test kit answers today; a Airthings radon monitor keeps answering for Tallahatchie County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Tallahatchie County carries, the zone explainer covers what it does and doesn't tell you about any one house.